feat(invitations): add invitation model

modules/invitations/server/models/invitation.server.model.js

@@ -0,0 +1,57 @@
+'use strict';
+
+/**
+ * Module dependencies
+ */
+var mongoose = require('mongoose'),
+  Schema = mongoose.Schema,
+  validator = require('validator');
+
+/**
+ * A Validation function for local strategy email
+ */
+var validateLocalStrategyEmail = function (email) {
+  return validator.isEmail(email, {require_tld: false});
+};
+
+/**
+ * Peer Schema
+ */
+var InvitationSchema = new Schema({
+  user: {
+    type: Schema.Types.ObjectId,
+    ref: 'User'
+  },
+  to_user: {
+    type: Schema.Types.ObjectId,
+    ref: 'User'
+  },
+  to_email: {
+    type: String,
+    unique: 'email already exists',
+    required: 'Please fill in a email address',
+    lowercase: true,
+    trim: true,
+    default: '',
+    validate: [validateLocalStrategyEmail, 'Please fill a valid email address']
+  },
+  status: {
+    type: Number,
+    default: 0    //0 is unregistered invitation, 1 already invite friend, 2 is already registered
+  },
+  token: {
+    type: String
+  },
+  expiresat: {
+    type: Date
+  },
+  registeredat: {
+    type: Date
+  },
+  createdat: {
+    type: Date,
+    default: Date.now
+  }
+});
+
+mongoose.model('Invitation', InvitationSchema);